883. Certain roots weaken

The omission of s in the active persons (ácchāittam, ácchāittām, ácchāitta) is a case of very rare occurrence; all the quotable examples were given above (233 e). As to the like omission in middle persons, see 881. The ChU. has twice ávāstam for avāts-tam (√vasdwell): this may be viewed as another case of total disappearance of the sibilant, and consequent restoration of the final radical to its original form.